According to a September 23, 2021 article out of China, they report that “Chinese researchers have discovered by employing big-data analysis that the COVID-19 pandemic in the United States might have started to spread around in September 2019” [1]
“According to… a preprint in ChinaXiv, a series of previous studies showed that the United States, Spain, France, Italy, Brazil and other countries had shown signs of being hit by the virus before its outbreak in China” [2]
“The result indicated that, for the 12 U.S. states, the possible dates of the first infection, with a probability of 50 percent, fall mostly between August and October 2019, while the earliest is April 26, 2019 on Rhode Island, and the latest is Nov. 30, 2019 in Delaware.”
Other novel approaches suggested the virus started in China earlier than officially declared, as early as October-November 2021.